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Equipment Discussions >> Cats & Casses

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powerstroke01
professor emeritus


Reged: 06/19/07

Loc: Western Sierra Nevada Foothill...
9.25 or 11" edge hd or at10rc?
      #5678625 - 02/13/13 11:59 PM

I have a hypertuned losmandy g11. I will be using the new scope for photographic purposes only.
Which of these 3 would be the vbetter choice and why?


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KDizzle
scholastic sledgehammer


Reged: 09/12/08

Loc: Woodinville, WA
Re: 9.25 or 11" edge hd or at10rc? new [Re: powerstroke01]
      #5678639 - 02/14/13 12:13 AM

at10rc pros: backfocus, excellent thermal stability, minimal dew issues.
at10rc cons: collimation is unpleasant. field is not perfectly flat for large chips.
edge pros: super flat field, can run hyperstar for super wide field, easier collimation
edge cons: dew, cruddy backfocus distance which is also exacting

so get the cdk 12.5.


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orlyandico
Postmaster
*****

Reged: 08/10/09

Loc: Singapore
Re: 9.25 or 11" edge hd or at10rc? new [Re: KDizzle]
      #5678668 - 02/14/13 12:43 AM

a cdk12.5 is quite costly and a G11 won't carry it.

between the choices I'd go with the 11 EDGE.

there is no 0.7X reducer for the 9.25 EDGE yet, but if there were the 9.25 (or even the 8) are less bulky. if doing hyperstar however the 11 is a better choice as you need all the focal length you can get.


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powerstroke01
professor emeritus


Reged: 06/19/07

Loc: Western Sierra Nevada Foothill...
Re: 9.25 or 11" edge hd or at10rc? new [Re: orlyandico]
      #5679623 - 02/14/13 02:30 PM

Thanks. Im really liking the 11" Edge..

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Escher
Pooh-Bah
*****

Reged: 08/30/07

Loc: Fenton, MI
Re: 9.25 or 11" edge hd or at10rc? new [Re: powerstroke01]
      #5679723 - 02/14/13 03:16 PM

Do you plan to possibly go with Hyperstar? If so, just get the standard C11 as there is no benefit of the Edge system for hyperstar use... (The edge correctors are in the rear baffle, not used with hyperstar).

Edited by Escher (02/14/13 03:16 PM)


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powerstroke01
professor emeritus


Reged: 06/19/07

Loc: Western Sierra Nevada Foothill...
Re: 9.25 or 11" edge hd or at10rc? new [Re: Escher]
      #5679908 - 02/14/13 05:15 PM

man. I just dont know anymore. ahha
I want to go hyperstar but i really like the idea of not having a moving mirror. THats the whole reason im getting rid of my meade 10"


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powerstroke01
professor emeritus


Reged: 06/19/07

Loc: Western Sierra Nevada Foothill...
Re: 9.25 or 11" edge hd or at10rc? new [Re: powerstroke01]
      #5680292 - 02/14/13 09:59 PM

Anyone else? THe price of the FR for the 11" edge is a major turn off.

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jrcrillyAdministrator
Refractor wienie no more
*****

Reged: 04/30/03

Loc: NE Ohio
Re: 9.25 or 11" edge hd or at10rc? new [Re: powerstroke01]
      #5680303 - 02/14/13 10:06 PM

Quote:

i really like the idea of not having a moving mirror. THats the whole reason im getting rid of my meade 10"




That's a strong point for the RC. Between that and the cooling and dew issues it was easy for me to move away from SCTs.


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powerstroke01
professor emeritus


Reged: 06/19/07

Loc: Western Sierra Nevada Foothill...
Re: 9.25 or 11" edge hd or at10rc? new [Re: jrcrilly]
      #5680342 - 02/14/13 10:36 PM

Quote:

Quote:

i really like the idea of not having a moving mirror. THats the whole reason im getting rid of my meade 10"




That's a strong point for the RC. Between that and the cooling and dew issues it was easy for me to move away from SCTs.


Yeah thats why i love the idea of an RC..
BUT! could i live with the 2000mm f/l?? I cant find any info on a reducer for the at10rc... So im guessing one is not available? Im so torn here.


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powerstroke01
professor emeritus


Reged: 06/19/07

Loc: Western Sierra Nevada Foothill...
Re: 9.25 or 11" edge hd or at10rc? new [Re: powerstroke01]
      #5680348 - 02/14/13 10:39 PM

Another question i have, what about dew on the at10rc? I have a dewbuster. But im wondering how one would combat dew on the RC??

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jrcrillyAdministrator
Refractor wienie no more
*****

Reged: 04/30/03

Loc: NE Ohio
Re: 9.25 or 11" edge hd or at10rc? new [Re: powerstroke01]
      #5680351 - 02/14/13 10:41 PM

Quote:

BUT! could i live with the 2000mm f/l?? I cant find any info on a reducer for the at10rc... So im guessing one is not available? Im so torn here.




I never considered a reducer; for me, the whole point of a Cass variant is to achieve 2000mm or more in a manageable package. If I wanted to shoot at shorter focal lengths I'd select some other configuration.


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jrcrillyAdministrator
Refractor wienie no more
*****

Reged: 04/30/03

Loc: NE Ohio
Re: 9.25 or 11" edge hd or at10rc? new [Re: powerstroke01]
      #5680359 - 02/14/13 10:44 PM

Quote:

Another question i have, what about dew on the at10rc? I have a dewbuster. But im wondering how one would combat dew on the RC??




I used to have real dew problems with various SCTs and refractors. With the RC's open tube and fans I've never had an issue.


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powerstroke01
professor emeritus


Reged: 06/19/07

Loc: Western Sierra Nevada Foothill...
Re: 9.25 or 11" edge hd or at10rc? new [Re: jrcrilly]
      #5680363 - 02/14/13 10:46 PM

Quote:

Quote:

BUT! could i live with the 2000mm f/l?? I cant find any info on a reducer for the at10rc... So im guessing one is not available? Im so torn here.




I never considered a reducer; for me, the whole point of a Cass variant is to achieve 2000mm or more in a manageable package. If I wanted to shoot at shorter focal lengths I'd select some other configuration.


True. Ive got my at65edq for wide field. But id like something else in the 1000-1200mm range too. Hmm.
I really do like the 10" RC..


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powerstroke01
professor emeritus


Reged: 06/19/07

Loc: Western Sierra Nevada Foothill...
Re: 9.25 or 11" edge hd or at10rc? new [Re: jrcrilly]
      #5680371 - 02/14/13 10:52 PM

Quote:

Quote:

Another question i have, what about dew on the at10rc? I have a dewbuster. But im wondering how one would combat dew on the RC??




I used to have real dew problems with various SCTs and refractors. With the RC's open tube and fans I've never had an issue.


Interesting. I would think dew would be more of an issue because it is open. My buddies orion 8" astrograph scope dew'd up bad the other night. THats why i ask.

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jrcrillyAdministrator
Refractor wienie no more
*****

Reged: 04/30/03

Loc: NE Ohio
Re: 9.25 or 11" edge hd or at10rc? new [Re: powerstroke01]
      #5680389 - 02/14/13 11:13 PM

Quote:

I would think dew would be more of an issue because it is open. My buddies orion 8" astrograph scope dew'd up bad the other night. THats why i ask.




I've had Newt secondaries dew up, but never primaries. Keeping the air moving in the RC tube seems to keep the secondary clear.


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jrcrillyAdministrator
Refractor wienie no more
*****

Reged: 04/30/03

Loc: NE Ohio
Re: 9.25 or 11" edge hd or at10rc? new [Re: powerstroke01]
      #5680394 - 02/14/13 11:15 PM

Quote:

But id like something else in the 1000-1200mm range too.




That's midsize refractor territory, and a very useful range. It does mean keeping a third OTA on hand. I just sold my TOA-130 so I have a gap there but I'll pick up another refractor sooner or later.


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powerstroke01
professor emeritus


Reged: 06/19/07

Loc: Western Sierra Nevada Foothill...
Re: 9.25 or 11" edge hd or at10rc? new [Re: jrcrilly]
      #5680441 - 02/14/13 11:44 PM

Quote:

Quote:

But id like something else in the 1000-1200mm range too.




That's midsize refractor territory, and a very useful range. It does mean keeping a third OTA on hand. I just sold my TOA-130 so I have a gap there but I'll pick up another refractor sooner or later.


yeah. Thats probably what ill do as well.

Thanks for all the help.


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mega256
scholastic sledgehammer
*****

Reged: 05/10/07

Loc: N of Tampa
Re: 9.25 or 11" edge hd or at10rc? new [Re: powerstroke01]
      #5680491 - 02/15/13 12:34 AM

I just bought a C11-hd...Its a very nice scope..
I had a 8" RC and still have a 6"RC..I realy like the RC scopes for photo work....But I live in humid Florida
and open tubes tend to need cleaning because of dew and damp
conditions...When it came time to put over 3k in a scope,I got the C11-hd,the closed tube helps a lot to keep the mirror clean and cleaning the corrector is easy. But a closed tube type RC is very difficult for me to clean,it has to be taken apart and I didn't want to go through the alignment
system.Open (trust type ) RCs are $$$...but you can get to the primary for cleaning....But having both I think the optics in the RCs are just great.


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pfile
Post Laureate


Reged: 06/14/09

Re: 9.25 or 11" edge hd or at10rc? new [Re: mega256]
      #5680610 - 02/15/13 02:49 AM

i have an at10rc and a G11, albeit stock worm and not hypertuned.

i just gave up and got a mach1gto. imaging at that FL was not impossible with the G11 but i had to throw away a lot of subs.

and i had to throw away 100% of subs until i started using an OAG.


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powerstroke01
professor emeritus


Reged: 06/19/07

Loc: Western Sierra Nevada Foothill...
Re: 9.25 or 11" edge hd or at10rc? new [Re: pfile]
      #5680839 - 02/15/13 08:32 AM

Quote:

i have an at10rc and a G11, albeit stock worm and not hypertuned.

i just gave up and got a mach1gto. imaging at that FL was not impossible with the G11 but i had to throw away a lot of subs.

and i had to throw away 100% of subs until i started using an OAG.


I've got the ovision worm as well.
I'm just wondering though, I'm currently imaging at 1500mm and not throwing away any subs. Would that change going up 500mm? I mean I'd be using the same guide scope. So I'd think my guiding would stay the same.


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